diff --git a/lib/isc/win32/socket.c b/lib/isc/win32/socket.c
index b2e8798edf..f5bac3218d 100644
--- a/lib/isc/win32/socket.c
+++ b/lib/isc/win32/socket.c
@@ -3106,7 +3106,7 @@ isc__socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
 isc_result_t
 isc__socket_sendtov2(isc_socket_t *sock, isc_bufferlist_t *buflist,
 		     isc_task_t *task, isc_taskaction_t action, const void *arg,
-		     isc_sockaddr_t *address, struct in6_pktinfo *pktinfo
+		     isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
 		     unsigned int flags)
 {
 	isc_socketevent_t *dev;